A DC relay without a holding current

Abstract

The present invention relates to the technical field of relays, and provides a DC relay without a holding current. The relay includes an outer cover, a fixing frame, a circuit board, a first coil holder, a second coil holder, a first magnetic coil, a second magnetic coil, a set of common contact pieces, at least one set of normally closed contact pieces, at least one set of normally open contact pieces, a set of control contact pieces, a permanent magnet, a permanent magnet bracket, a set of connecting wires, and a set of movable contact pieces. The end faces of the iron cores of the first magnetic coil and the second magnetic coil face coaxially. The polarities of the two end faces of the permanent magnet are opposite, and the two end faces of the permanent magnet respectively face the end face of the iron core of the first magnetic coil and the end face of the iron core of the second magnetic coil. The positive and negative current control circuit of the magnetic coil controls the iron cores of the first magnetic coil and the second magnetic coil to change the magnetic poles to adsorb or bounce the permanent magnet, driving the permanent magnet bracket to move, and then driving the contacts of the set of movable contact pieces to connect with the sets of normally open contact pieces or the sets of normally closed contact pieces. The present invention solves the problem that the existing relay requires a holding current for a long time to maintain the suction, resulting in energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and particularly to a DC relay without a holding current for suction. Background Art

[0002] During the energized operation of existing relays, their coils must always maintain a certain holding current, consuming a certain amount of electrical energy to maintain their suction force. The holding current in the coil generates a magnetic field to attract the contact link. When the coil current is interrupted, the contact link is ejected from the magnetic pole surface of the coil under the action of a spring, and the contact completes the closing and opening of a set of switches, as well as the closing and opening of another set of switches. Although the holding current of the coil during the operation of the relay is not large, in some application scenarios where a long-term maintained state is required, significant energy consumption will accumulate over a long time. For example, in the series and parallel use of lithium batteries, when using such a relay to remove a single battery from the battery pack at the overcharge point, over-discharge, or when the battery is overheated to achieve more advanced energy-saving protection, the relay requires a long-term holding current consumption. Therefore, how to effectively reduce the power consumption of the relay is an urgent problem to be solved. Summary of the Invention

[0003] Therefore, in view of the above problems, the present invention proposes a DC relay without a holding current for suction, which has a simple and reasonable structure, low manufacturing cost, energy-saving use, and does not require energy consumption for maintaining the suction current.

[0004] To solve this technical problem, the present invention adopts the following solution: a DC relay without a holding suction current, comprising an outer cover, a fixing frame, a circuit board, a first coil frame, a second coil frame, a first magnetic coil, a second magnetic coil, a set of common contact pieces, at least one set of normally closed contact pieces, at least one set of normally open contact pieces and a set of control contact pieces. The circuit board is arranged on the top of the fixing frame. A set of common contact pieces, at least one set of normally closed contact pieces, at least one set of normally open contact pieces and a set of control contact pieces are arranged in parallel and side by side through the bottom plate of the fixing frame. The outer cover covers the fixing frame and is connected to the peripheral edge of the upper surface of the bottom plate of the fixing frame. It further comprises a permanent magnet, a permanent magnet bracket, a set of connecting wires and a set of movable contact pieces. The first magnetic coil and the second magnetic coil are respectively arranged on the first coil frame and the second coil frame. The first coil frame and the second coil frame are symmetrically arranged at the left and right parts inside the fixing frame and are spaced apart from each other. The iron cores of the first magnetic coil and the second magnetic coil are coaxial in the end face direction, and the mutually facing iron core ends of the first magnetic coil and the second magnetic coil have the same magnetic poles after being energized. The permanent magnet bracket is movably arranged horizontally between the first coil frame and the second coil frame. The permanent magnet is arranged on the permanent magnet bracket. The two end faces of the permanent magnet have opposite magnetic polarities, and the two end faces of the permanent magnet are respectively facing the iron core end face of the first magnetic coil and the iron core end face of the second magnetic coil. One end of a set of common contact pieces inside the fixing frame is respectively connected to a set of movable contact pieces through a set of connecting wires. A set of movable contact pieces are arranged at the bottom of the permanent magnet bracket between one end of each group of normally closed contact pieces and one end of each group of normally open contact pieces inside the fixing frame, and the number of contact points of a set of movable contact pieces matches the number of groups of normally closed contact pieces and normally open contact pieces. The switch K of the circuit board is arranged on one side of the circuit board at the side of the normally closed contact pieces. A conducting pressing plate for closing or disconnecting the switch K is arranged on the switch K of the circuit board at one side of the top of the permanent magnet bracket. A magnetic coil forward and reverse current control circuit is arranged on the circuit board. The power supply end of the magnetic coil forward and reverse current control circuit is connected to a set of control contact pieces. The magnetic coil forward and reverse current control circuit is connected to the first magnetic coil and the second magnetic coil. The magnetic coil forward and reverse current control circuit controls the iron cores of the first magnetic coil and the second magnetic coil to change the magnetic poles to adsorb or bounce off the permanent magnet, driving the permanent magnet bracket to move, and then driving the contact points of a set of movable contact pieces to connect with each group of normally open contact pieces or each group of normally closed contact pieces.

[0005] Further, the forward and reverse current control circuit of the magnetic coil includes a switch K, diodes D1, D2, D3, a field effect transistor T1, transistors T2, T3, a capacitor C1, resistors R1, R2, R3, R4. The positive pole of diode D1, one end of switch K, one end of resistor R1, and the gate of field effect transistor T1 are all connected to the positive power supply +Ec. The negative pole of diode D1 is connected to the source of field effect transistor T1 and one end of capacitor C1. The other end of switch K is connected to one end of the first magnetic coil L1, one end of resistor R3, the collector of transistor T2, the positive pole of diode D2, and the negative pole of diode D3. The other end of the first magnetic coil L1 is connected to one end of the second magnetic coil L2. The other end of the second magnetic coil L2 is connected to the drain of field effect transistor T1, one end of resistor R4, one end of resistor R2, and the collector of transistor T3. The other end of resistor R4 is connected to the negative pole of diode D2 and the positive pole of diode D3. The other end of resistor R2 is connected to the base of transistor T2. The emitters of transistors T2 and T3, the other end of resistor R1, the other end of capacitor C1, and the emitter of transistor T3 are connected to the negative power supply. The other end of resistor R3 is connected to the base of transistor T3.

[0006] Furthermore, the switch K of the circuit board is two copper foil pads arranged at intervals. The conducting pressure plate of the magnet bracket includes a connecting guide plate and two buckle contacts provided at both ends of the connecting guide plate. The arrangement of the two buckle contacts is adapted to the two copper foil pads of the switch K on the circuit board. There is a slot for the connecting guide plate on the magnet bracket to move at the position of the switch K on the circuit board. The movement of the connecting guide plate of the magnet bracket drives the two buckle contacts to connect with the two copper foil pads of the switch K to make the switch K connected, or the two buckle contacts separate from the two copper foil pads of the switch K to make the switch K disconnected.

[0007] Further, on both sides of the mutually facing ends of the first coil holder and the second coil holder, guiding grooves are respectively provided. On both sides of the magnet bracket, guiding bars extending towards both ends and adapted to the guiding grooves are provided at the horizontally corresponding positions of the guiding grooves of the first coil holder and the second coil holder. The guiding bars of the magnet bracket can be horizontally moved through the guiding grooves of the first coil holder and the second coil holder.

[0008] Further, the magnet is a neodymium iron boron magnet.

[0009] By adopting the foregoing technical solution, the beneficial effects of the present invention are as follows: By arranging two first coil holders and second coil holders symmetrically at intervals, the iron cores of the first magnetic coil and the second magnetic coil are coaxially oriented at the end faces, and the iron core ends of the first magnetic coil and the second magnetic coil facing each other have the same magnetic poles when energized. The magnet is arranged on the magnet bracket, and the magnetic pole polarities at both end faces of the magnet are opposite, and the two end faces of the magnet are respectively facing the iron core end face of the first magnetic coil and the iron core end face of the second magnetic coil. A magnetic coil forward and reverse current control circuit is set to control the iron cores of the first magnetic coil and the second magnetic coil to change the current in the reverse direction, so that the magnetic pole of the iron core changes to adsorb or bounce the magnet, driving the magnet bracket to move, and then driving the contacts of a group of movable contacts to connect with each group of normally open contacts or each group of normally closed contacts. In normal use, according to the use requirements, the magnet is adsorbed and connected to the iron core of the first magnetic coil or the second magnetic coil, so that a group of movable contacts on the magnet bracket are connected with a group of normally open contacts or a group of normally closed contacts to keep normally open or normally closed. When a group of control contacts are energized, the magnetic pole polarity of the iron core of the first magnetic coil adsorbing the magnet changes, boosting the magnet towards the iron core of the second magnetic coil. At the same time, the iron core of the second magnetic coil generates a magnetic field with a different magnetic pole from the magnet to adsorb the magnet towards the iron core of the second magnetic coil, causing the magnet bracket to move towards the second magnetic coil, driving a group of movable contacts to disconnect from a group of normally open contacts or connect with a group of normally closed contacts to achieve closing. When a group of control contacts are de-energized, the magnetic pole polarity of the iron core of the second magnetic coil adsorbing the magnet changes, boosting the magnet towards the iron core of the first magnetic coil. At the same time, the iron core of the first magnetic coil generates a magnetic field with a different magnetic pole polarity from the magnet to adsorb the magnet towards the iron core of the first magnetic coil, causing the magnet bracket to move towards the first magnetic coil, driving a group of movable contacts to connect with a group of normally open contacts or disconnect from a group of normally closed contacts to achieve closing. It realizes the switching between normally open and normally closed when energized and automatically and stably restores the suction state before power-on when de-energized. The relay can maintain the suction state without consuming energy for the suction maintenance current. The structure is simple and reasonable, the manufacturing cost is low, and the energy is saved in use, and it can be widely promoted and applied. Description of the Drawings

[0010] Figure 1 is a partial structural schematic diagram of an embodiment of the present invention;

[0011] Figure 2 is a partial exploded structural schematic diagram of an embodiment of the present invention;

[0012] Figure 3 is the circuit schematic diagram of the magnetic coil forward and reverse current control circuit of an embodiment of the present invention. Detailed Embodiments

[0013] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0014] Refer to Figures 1 - 3, preferably, the DC relay without holding current of the present invention includes a transparent outer cover, a fixing bracket 1, a circuit board 2, a first coil holder 3, a second coil holder 4, a first magnetic coil, a second magnetic coil, a magnet 5, a magnet bracket 6, a set of connecting wires 7, a set of movable contact pieces 8, a set of common contact pieces 9, a set of normally closed contact pieces 10, a set of normally open contact pieces 11 and a set of control contact pieces 12. The circuit board 2 is a PCB circuit board and is arranged on the top of the fixing bracket 1. A set of common contact pieces 9, a set of normally closed contact pieces 10, a set of normally open contact pieces 11 and a set of control contact pieces 12 are arranged in parallel and side by side through the bottom plate 101 of the fixing bracket 1. The transparent outer cover is arranged on the fixing bracket 1 and is connected to the periphery of the upper surface of the bottom plate 101 of the fixing bracket 1. The transparent outer cover is used to protect the structure components arranged on the fixing bracket 1 above the bottom plate of the fixing bracket 1, such as dust prevention. The first magnetic coil and the second magnetic coil are respectively arranged on the first coil holder 3 and the second coil holder 4. The first coil holder 3 and the second coil holder 4 are symmetrically arranged on the left and right parts inside the fixing bracket 1 and are spaced apart between the first coil holder 3 and the second coil holder 4. The iron cores of the first magnetic coil and the second magnetic coil are coaxial and face each other, and the iron core ends of the first magnetic coil and the second magnetic coil facing each other have the same magnetic poles when energized. The magnet bracket 6 is movably arranged horizontally between the first coil holder 3 and the second coil holder 4. The magnet 5 is arranged on the magnet bracket 6. The two end faces of the magnet 5 have opposite magnetic polarities, and the two end faces of the magnet 5 are respectively opposite to the iron core end face of the first magnetic coil and the iron core end face of the second magnetic coil. One end of a set of common contact pieces 9 inside the fixing bracket 1 is respectively connected to a set of movable contact pieces 8 through a set of connecting wires 7. A set of movable contact pieces 8 is arranged at the bottom of the magnet bracket 6 between one end of a set of normally closed contact pieces 10 and one end of a set of normally open contact pieces 11 inside the fixing bracket 1. On both sides of the mutually facing ends of the first coil holder 3 and the second coil holder 4, guiding grooves 31 and 41 are respectively provided. On both sides of the magnet bracket 6 at the horizontal corresponding positions of the guiding grooves 31 and 41 of the first coil holder 3 and the second coil holder 4, guiding strips 61 extending towards both ends and adapted to the guiding grooves 31 and 41 are provided. The guiding strips 61 of the magnet bracket 6 are movably arranged horizontally through the guiding grooves 31 and 41 of the first coil holder 3 and the second coil holder 4. The switch K of the circuit board 2 is arranged on one side of the circuit board 2 beside a set of normally closed contact pieces 10. The switch K of the circuit board 2 is two copper foil pads arranged at intervals. On one side of the top of the magnet bracket 6, there is a conducting pressing plate 62 for closing or disconnecting the switch K. The conducting pressing plate 62 of the magnet bracket 6 includes a connecting guide plate and two buckle contacts arranged at both ends of the connecting guide plate. The arrangement of the two buckle contacts is adapted to the two copper foil pads of the switch K of the circuit board 2. At the position of the switch K on the circuit board 2, there is a slot for the connecting guide plate on the magnet bracket 6 to move. The movement of the connecting guide plate of the magnet bracket 6 drives the two buckle contacts to connect with the two copper foil pads of the switch K to connect the switch K or the two buckle contacts to separate from the two copper foil pads of the switch K to disconnect the switch K.A positive and negative current control circuit for a magnetic coil is provided on the circuit board 2. The power supply terminal of the positive and negative current control circuit for the magnetic coil is connected to a set of control contacts 12. The positive and negative current control circuit for the magnetic coil is connected to the first magnetic coil and the second magnetic coil. The positive and negative current control circuit for the magnetic coil controls the positive and negative directions of the currents of the iron cores of the first magnetic coil and the second magnetic coil to change the magnetic poles for adsorption or repulsion, driving the magnet 5 to move the magnet holder 6, and further driving the contacts of a set of movable contacts 8 to connect with a set of normally open contacts 11 or a set of normally closed contacts 10.

[0015] Reference Figure 3 The positive and negative current control circuit for the magnetic coil includes a switch K, diodes D1, D2, D3, a field effect transistor T1, transistors T2, T3, a capacitor C1, resistors R1, R2, R3, R4. The positive electrode of the diode D1, one end of the switch K, one end of the resistor R1, and the gate of the field effect transistor T1 are all connected to the positive power supply +Ec. The negative electrode of the diode D1 is connected to the source of the field effect transistor T1 and one end of the capacitor C1. The other end of the switch K is connected to one end of the first magnetic coil L1, one end of the resistor R3, the collector of the transistor T2, the positive electrode of the diode D2, and the negative electrode of the diode D3. The other end of the first magnetic coil L1 is connected to one end of the second magnetic coil L2. The other end of the second magnetic coil L2 is connected to the drain of the field effect transistor T1, one end of the resistor R4, one end of the resistor R2, and the collector of the transistor T3. The other end of the resistor R4 is connected to the negative electrode of the diode D2 and the positive electrode of the diode D3. The other end of the resistor R2 is connected to the base of the transistor T2. The emitter of the transistor T2, the other end of the resistor R1, the other end of the capacitor C1, and the emitter of the transistor T3 are connected to the negative power supply. The other end of the resistor R3 is connected to the base of the transistor T3.

[0016] Working principle of the forward and reverse current control circuit of the magnetic coil: When +Ec is powered on, the switch K on the circuit board 2 is in the on state under the connection of the two snap contacts of the conduction pressing plate 62 of the magnet bracket 6. The capacitor C1 is charged through the diode D1. The conduction of the switch K makes the triode T3 conduct. Since the base of the triode T3 is at a high level and it is not conducting, the triode T2 is also not conducting. At this time, the coil current flows from the first magnetic coil L1 to the second magnetic coil L2, causing the magnetic pole polarity of the iron core on the first magnetic coil L1 to reverse, and then boosting the magnet 5 towards the iron core of the second magnetic coil L2. At the same time, the iron core of the second magnetic coil L2 also has a change in magnetic pole polarity to adsorb the magnet, causing the magnet bracket 6 to move towards the iron core of the second magnetic coil L2, making the two snap contacts of the conduction pressing plate 62 of the magnet bracket 6 separate from the switch K to disconnect the switch K, and causing the contact of the movable contact piece 8 on the magnet bracket 6 to change from connecting with a set of normally open contact pieces 11 to connecting with a set of normally closed contact pieces 10; When +Ec is powered off, the capacitor C1 discharges, the diode D1 does not conduct, the field effect transistor T1 conducts due to the low level of the gate, the triode T2 conducts, and the triode T3 does not conduct due to the low level of the base. At this time, the coil current flows from the second magnetic coil L2 to the first magnetic coil L1, causing the magnetic pole polarity of the iron core on the second magnetic coil L2 to reverse, and then boosting the magnet towards the iron core of the first magnetic coil L1. At the same time, the iron core of the first magnetic coil L1 also has a change in magnetic pole polarity to adsorb the magnet, causing the magnet bracket 6 to move towards the iron core of the first magnetic coil L1, making the two snap contacts of the conduction pressing plate 62 of the magnet bracket 6 contact the switch K to connect the switch K, and causing the contact of the movable contact piece 8 on the magnet bracket 6 to change from connecting with a set of normally closed contact pieces 10 to connecting with a set of normally open contact pieces 11. After the capacitor C1 discharges, the voltage is too low to maintain, so it returns to the suction state before power-on.

[0017] In the present invention, the magnet can be a neodymium iron boron magnet or other magnets that maintain strong magnetic attraction. The outer cover can also be made of opaque plastics, etc. The number of sets of normally open contact pieces and normally closed contact pieces can be increased to two sets, three sets, etc. according to the pin setting requirements of the implemented relay. It is only necessary to set the number of contacts of the movable contact piece to correspond and match the number of sets of the normally open contact pieces and normally closed contact pieces. The forward and reverse current control circuit of the magnetic coil can also adopt other control circuits that can change the magnetic pole magnetism of the first magnetic coil L1 and the second magnetic coil L2.

[0018] Although the present invention is specifically shown and described in combination with the preferred implementation embodiments, those skilled in the art should understand that various changes can be made to the present invention in terms of form and details without departing from the spirit and scope of the present invention defined by the appended claims, and all are within the protection scope of the present invention.

Claims

1. A DC relay without a holding suction current, comprising an outer cover, a fixing frame, a circuit board, a first coil holder, a second coil holder, a first magnetic coil, a second magnetic coil, a set of common contact pieces, at least one set of normally closed contact pieces, at least one set of normally open contact pieces and a set of control contact pieces. The circuit board is arranged on the top of the fixing frame. A set of common contact pieces, at least one set of normally closed contact pieces, at least one set of normally open contact pieces and a set of control contact pieces are arranged in parallel and side by side through the bottom plate of the fixing frame. The outer cover is arranged on the fixing frame and is connected to the peripheral edge of the upper surface of the bottom plate of the fixing frame. Characterized in that: It further includes a permanent magnet, a permanent magnet bracket, a set of connecting wires and a set of movable contact pieces. The first magnetic coil and the second magnetic coil are respectively arranged on the first coil holder and the second coil holder. The first coil holder and the second coil holder are symmetrically arranged on the left and right parts inside the fixing frame and are spaced apart from each other. The iron cores of the first magnetic coil and the second magnetic coil face coaxially towards each other, and the mutually facing iron core ends of the first magnetic coil and the second magnetic coil have the same magnetic poles after being energized. The permanent magnet bracket is movably arranged horizontally between the first coil holder and the second coil holder. The permanent magnet is arranged on the permanent magnet bracket. The two end faces of the permanent magnet have opposite magnetic polarities, and the two end faces of the permanent magnet are respectively facing the iron core end face of the first magnetic coil and the iron core end face of the second magnetic coil. One end of a set of common contact pieces located inside the fixing frame is respectively connected to a set of movable contact pieces through a set of connecting wires. A set of movable contact pieces are arranged at the bottom of the permanent magnet bracket between one end of each set of normally closed contact pieces and one end of each set of normally open contact pieces located inside the fixing frame, and the number of contacts of a set of movable contact pieces matches the number of sets of normally closed contact pieces and normally open contact pieces. The switch K of the circuit board is arranged on one side of the circuit board beside the normally closed contact pieces. A conducting pressure plate for closing or disconnecting the switch K is arranged on one side of the top of the permanent magnet bracket on the switch K of the circuit board. A magnetic coil positive and negative current control circuit is arranged on the circuit board. The power supply end of the magnetic coil positive and negative current control circuit is connected to a set of control contact pieces. The magnetic coil positive and negative current control circuit is connected to the first magnetic coil and the second magnetic coil. The magnetic coil positive and negative current control circuit controls the iron cores of the first magnetic coil and the second magnetic coil to change their magnetic poles to adsorb or bounce off the permanent magnet, driving the permanent magnet bracket to move, and then driving the contacts of a set of movable contact pieces to connect with each set of normally open contact pieces or each set of normally closed contact pieces.

2. The DC relay without a holding suction current according to claim 1, Characterized in that: The positive and negative current control circuit of the magnetic coil includes a switch K, diodes D1, D2, D3, a field effect transistor T1, transistors T2, T3, a capacitor C1, resistors R1, R2, R3, R4. The positive electrode of diode D1, one end of switch K, one end of resistor R1, and the gate of field effect transistor T1 are all connected to the positive power supply +Ec. The negative electrode of diode D1 is connected to the source of field effect transistor T1 and one end of capacitor C1. The other end of switch K is connected to one end of the first magnetic coil L1, one end of resistor R3, the collector of transistor T2, the positive electrode of diode D2, and the negative electrode of diode D3. The other end of the first magnetic coil L1 is connected to one end of the second magnetic coil L2. The other end of the second magnetic coil L2 is connected to the drain of field effect transistor T1, one end of resistor R4, one end of resistor R2, and the collector of transistor T3. The other end of resistor R4 is connected to the negative electrode of diode D2 and the positive electrode of diode D3. The other end of resistor R2 is connected to the base of transistor T2. The emitter of transistor T2, the other end of resistor R1, the other end of capacitor C1, and the emitter of transistor T3 are connected to the negative power supply. The other end of resistor R3 is connected to the base of transistor T3.

3. The DC relay without holding-in current according to claim 2, characterized in that: The switch K of the circuit board is two copper foil pads arranged at intervals. The conducting pressure plate of the magnet steel bracket includes a connecting guide plate and two buckle contacts arranged at both ends of the connecting guide plate. The arrangement of the two buckle contacts is adapted to the two copper foil pads of the switch K of the circuit board. There is a slot for the connecting guide plate on the magnet steel bracket to move at the position of the switch K on the circuit board. The movement of the connecting guide plate of the magnet steel bracket drives the two buckle contacts to connect with the two copper foil pads of the switch K to make the switch K connected, or the two buckle contacts separate from the two copper foil pads of the switch K to make the switch K disconnected.

4. The DC relay without holding-in current according to claim 1, characterized in that: On both sides of the mutually facing ends of the first coil bobbin and the second coil bobbin, guide grooves are respectively provided. On both sides of the magnet steel bracket, at the positions horizontally corresponding to the guide grooves of the first coil bobbin and the second coil bobbin, guide bars extending towards both ends and adapted to the guide grooves are provided. The guide bars of the magnet steel bracket can be horizontally moved through the guide grooves of the first coil bobbin and the second coil bobbin.

5. The DC relay without holding-in current according to claim 1, characterized in that: The magnet steel is a neodymium iron boron magnet steel.

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